What is al green back up train?

"Back Up Train" is a song by Al Green released in 1967. It was his first single as a solo artist and was recorded with the band the Soul Mates, who later became Green's backup band. The song was produced by Willie Mitchell and released on the Hot Line label. "Back Up Train" reached number five on the R&B charts and number 41 on the pop charts. It has since become a classic of the soul genre and is considered an important early recording in Green's career. The song features the classic Memphis soul sound, with horn stabs, a funky bassline, and Green's smooth vocals. The lyrics tell a story of heartache and the need to move on, with the chorus urging listeners to "get on board the back-up train."